Elementary optics and applications to fire control instruments (1922)
United States. Army. Ordnance Dept · Washington, Govt. Print. Off. · leaf 52
at first seems paradoxicalthat such a system can have any use since both object and imageare at an infinite distance. However, important modifications have been introduced, the mostimportant of which is the change of angle between any two bundlesbefore and after passage through the system. The… … Fig. 52.—Telescopic system. by passage through the system. Two points in the object whichsubtend a relatively small angle when viewed by the naked eye willsubtend a much larger angle viewed through the system. As in-creased angular size is associated with nearness of the object, theuse of such a…
Optics · Optical instruments · Fire control (Gunnery) -- Optical equipment
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